Power supply short circuit protection system with automatic restarting and soft-starting functions and protection method

Abstract

The invention provides a power supply short circuit protection system with automatic restarting and soft-starting functions and a protection method of the power supply short circuit protection system. The system comprises a PWM (Pulse Width Modulation) controller, a power supply circuit, a soft starting circuit and a short circuit protection circuit. The invention further provides the protection method of the power supply short circuit protection system with automatic restarting and soft-starting functions. According to the system, the automatic restarting of the power supply circuit and the automatic setting of the soft starting circuit are realized by utilizing the short circuit protection circuit, so that the phenomenon that short circuit protection circuit cannot return to normal because being triggered to enter a protection state again due to the inputting of surge currents after the short circuit protection is finished is effectively prevented. Thus, compared with the conventional hiccup-type short circuit protection circuit with the soft-starting function, the short circuit protection circuit provided by the invention has the large capacitive load capacity because the surge currents which are input are effectively inhibited, so that the short circuit protection circuit provided by the invention is suitable for various power supply systems.

Description

technical field [0001] The invention relates to the technical field of power supply short circuit protection, in particular to a power supply short circuit protection system and method with automatic restart and soft start functions. [0002] Background technique [0003] The short-circuit protection system is the core protection unit in the power system. Its function is to detect the short-circuit protection status in the power system and control the power supply to prevent damage to the power system caused by excessive current during short-circuit. In the conventional power supply short-circuit protection system with soft-start function, the soft-start circuit can effectively prevent the overshoot of the input current only when the power supply is started. When the output terminal voltage returns to the normal value, the overshoot of the input current is larger than the overshoot of the input current when the power supply is started, especially when the capacitive load of...

AI Technical Summary

Problems solved by technology

In the conventional power supply short-circuit protection system with soft-start function, the soft-start circuit can effectively prevent the overshoot of the input current only when the power supply is started. When the output terminal voltage returns to the normal value, the overshoot of the input current is larger than the overshoot of the input current when the power supply is started, especially when the capacitive load of the power supply is large, it is easy to trigger the short-circuit protection system to enter the protection state again, resulting in malfunction of the short-circuit protection

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